Justin Koyumjan ha enfrentado a 141 oponentes a lo largo de su carrera.

Player Team(s) Games
Omar Ahmadzada
U20 Azerbaijan (Euro U20B)
1
Elkhan Akhmedov
U20 Russia (Euro U20B)
1
David Anda
U20 Hungary (Euro U20B)
1
Mihailo Andjelkovic
U20 Luxembourg (Euro U20B)
1
Mikhail Andrianov
U20 Russia (Euro U20B)
1
Philippe Arendt
U20 Luxembourg (Euro U20B)
1
Ben Arendt
U20 Luxembourg (Euro U20B)
1
Robert Barlund
U20 Finland (Euro U20B)
1
Theo Beaujean
U20 Belgium (Euro U20B)
1
Vadim Bicicov
U20 Moldova (Euro U20B)
1
Marcus Black-Phillips
U20 Ireland (Euro U20B)
1
Bendeguz Bonifert
U20 Hungary (Euro U20B)
1
Maik Bouwer
U20 Netherlands (Euro U20B)
1
Thibaut Bronchart
U20 Belgium (Euro U20B)
1
Lukas Bukovjan 1
Valon Bunjaku
U20 Kosovo (Euro U20B)
1
Simon Buysse
U20 Belgium (Euro U20B)
1
Thierry Cames
U20 Luxembourg (Euro U20B)
1
Sigfredo Casero-Ortiz
U20 Belgium (Euro U20B)
1
Guillaume Chaussy
U20 Luxembourg (Euro U20B)
1
Luftim Cikaqi
U20 Kosovo (Euro U20B)
1
Owen Connolly
U20 Ireland (Euro U20B)
1
Dylan Corkery
U20 Ireland (Euro U20B)
1
Andrei Cretu
U20 Moldova (Euro U20B)
1
Jordan Davis
U20 Azerbaijan (Euro U20B)
1
Ivan Delgado
U20 Luxembourg (Euro U20B)
1
Nicolae Domentii
U20 Moldova (Euro U20B)
1
Egor Dudov
U20 Belarus (Euro U20B)
1
Aidan Dunne
U20 Ireland (Euro U20B)
1
Aleksander Dziewa
U20 Poland (Euro U20B)
1
Iyen Enaruna
U20 Netherlands (Euro U20B)
1
Lucas Faijdherbe
U20 Netherlands (Euro U20B)
1
Caba Fazekas
U20 Hungary (Euro U20B)
1
Stefan Filipovic
U20 Hungary (Euro U20B)
1
Denilson Fonseca
U20 Luxembourg (Euro U20B)
1
Ylli Gashi
U20 Kosovo (Euro U20B)
1
Sean Gilmore
U20 Ireland (Euro U20B)
1
Danil Glavan
U20 Moldova (Euro U20B)
1
Clement Goffin
U20 Belgium (Euro U20B)
1
Daniel Golebiowski
U20 Poland (Euro U20B)
1
Artiom Griscenko
U20 Moldova (Euro U20B)
1
Tariq Guebaili
U20 Ireland (Euro U20B)
1
Lasse Gummerus
U20 Finland (Euro U20B)
1
Michael Hartig 1
Dion Haxhosaj
U20 Kosovo (Euro U20B)
1
Daniel Heaney
U20 Ireland (Euro U20B)
1
Tim Hoeve
U20 Netherlands (Euro U20B)
1
Eero Innamaa
U20 Finland (Euro U20B)
1
Christopher Jack
U20 Luxembourg (Euro U20B)
1
Muhamedali Janjeva
U20 Kosovo (Euro U20B)
1
Michal Jedrzejewski
U20 Poland (Euro U20B)
1
Henri Kantonen
U20 Finland (Euro U20B)
1
Jan Karlovsky 1
Daniil Karvanen
U20 Russia (Euro U20B)
1
Gaspar Kerpel-Fronius
U20 Hungary (Euro U20B)
1
Alexander Khomenko
U20 Russia (Euro U20B)
1
Aatu Kivimaki
U20 Finland (Euro U20B)
1
Szymon Kiwilsza
U20 Poland (Euro U20B)
1
Sergey Klyuev
U20 Russia (Euro U20B)
1
Teemu Knihtinen
U20 Finland (Euro U20B)
1
Jakub Kobel
U20 Poland (Euro U20B)
1
Martin Kolar 1
Michal Kolenda
U20 Poland (Euro U20B)
1
Michal Kolodziej
U20 Poland (Euro U20B)
1
Maksim Koratcov
U20 Belarus (Euro U20B)
1
Atik Koshi
U20 Kosovo (Euro U20B)
1
Hannes Koskinen
U20 Finland (Euro U20B)
1
Eduard Kotasek 1
Gabor Kovacs
U20 Hungary (Euro U20B)
1
Michal Kozak 1
Gergo Kozma
U20 Hungary (Euro U20B)
1
Boris Krnjajski
U20 Hungary (Euro U20B)
1
Edmond Kryeziju
U20 Kosovo (Euro U20B)
1
Csaba Kucsora
U20 Hungary (Euro U20B)
1
Lander Kuijt
U20 Belgium (Euro U20B)
1
Mikolaj Kurpisz
U20 Poland (Euro U20B)
1
Tim Lambrecht
U20 Belgium (Euro U20B)
1
Ryan Leonard
U20 Ireland (Euro U20B)
1
Malevy Leons
U20 Netherlands (Euro U20B)
1
Valtteri Leppanen
U20 Finland (Euro U20B)
1
Julien Lessel
U20 Luxembourg (Euro U20B)
1
Maksim Liutych
U20 Belarus (Euro U20B)
1
Andrei Lopatin
U20 Russia (Euro U20B)
1
Akbar Mammadov
U20 Azerbaijan (Euro U20B)
1
Edon Maxhuni
U20 Finland (Euro U20B)
1
Noah Medeot
U20 Luxembourg (Euro U20B)
1
Kirill Mikheev
U20 Russia (Euro U20B)
1
Vlad Mikulskiy
U20 Belarus (Euro U20B)
1
Vladimir Miscov
U20 Moldova (Euro U20B)
1
Zaccharie Mortant
U20 Belgium (Euro U20B)
1
Grigoriy Motovilov
U20 Russia (Euro U20B)
1
Jakub Musial
U20 Poland (Euro U20B)
1
Murad Mustafazade
U20 Azerbaijan (Euro U20B)
1
Marius Mwendanga
U20 Belgium (Euro U20B)
1
Martin Nabelek 1
Akos Nemeth
U20 Hungary (Euro U20B)
1
Tom Nesser
U20 Luxembourg (Euro U20B)
1
Lassi Nikkarinen
U20 Finland (Euro U20B)
1
Mate Papai
U20 Hungary (Euro U20B)
1
Tsimafei Paraliou
U20 Belarus (Euro U20B)
1
Etnik Peci
U20 Kosovo (Euro U20B)
1
Vadim Plahotniuc
U20 Moldova (Euro U20B)
1
Endar Poladkhanli
U20 Azerbaijan (Euro U20B)
1
Hannes Polla
U20 Finland (Euro U20B)
1
Marcel Ponitka
U20 Poland (Euro U20B)
1
Kirill Popov
U20 Russia (Euro U20B)
1
Calvin Poulina
U20 Netherlands (Euro U20B)
1
Andrei Rahozenka
U20 Belarus (Euro U20B)
1
Eoin Rockall
U20 Ireland (Euro U20B)
1
Conor Ryan
U20 Ireland (Euro U20B)
1
Denis Savca
U20 Moldova (Euro U20B)
1
Kevin Schutte
U20 Netherlands (Euro U20B)
1
Stanislav Secrier
U20 Moldova (Euro U20B)
1
Elshad Shirzadov
U20 Azerbaijan (Euro U20B)
1
Jakub Slavik 1
Andrei Stabrouski
U20 Belarus (Euro U20B)
1
Miroslav Stafl 1
Nichita Stirbu
U20 Moldova (Euro U20B)
1
Robert Sullivan
U20 Ireland (Euro U20B)
1
Matias Suvanto
U20 Finland (Euro U20B)
1
Mark Tikhonenko
U20 Russia (Euro U20B)
1
Agasiy Tonoyan
U20 Russia (Euro U20B)
1
Andre Toure
U20 Russia (Euro U20B)
1
Matt Treacy
U20 Ireland (Euro U20B)
1
Jakub Tuma 1
Kujtim Ujkani
U20 Kosovo (Euro U20B)
1
Killian Van Den Langenbergh
U20 Belgium (Euro U20B)
1
Boyd Van Der Vuurst
U20 Netherlands (Euro U20B)
1
Dylan Van Eyck
U20 Netherlands (Euro U20B)
1
Sam Van Oostrum
U20 Netherlands (Euro U20B)
1
Frantisek Vana 1
Vincent Vanden Berghe
U20 Belgium (Euro U20B)
1
Marijn Ververs
U20 Netherlands (Euro U20B)
1
Denis Vikentyev
U20 Belarus (Euro U20B)
1
Marcell Volgyi
U20 Hungary (Euro U20B)
1
Elay Wirjo
U20 Netherlands (Euro U20B)
1
Mathis Wolff
U20 Luxembourg (Euro U20B)
1
Anton Zaretski
U20 Belarus (Euro U20B)
1
Ramadan Zekiqi
U20 Kosovo (Euro U20B)
1
Tomasz Zelezniak
U20 Poland (Euro U20B)
1
David Zikla 1